<div dir="ltr">Hi Glenn, <div><br></div><div>I just looked through the manual for the Morningstar relay controller, and it looks like this should work. It can even power up to a 750mA load without needing a relay, which is more than enough to power one of those Zephyr Powervent fans. Thanks for the tip!</div><div><br></div><div>Cheers,</div><div>Dave</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Jun 3, 2025 at 3:12 PM Glenn <<a href="mailto:glenn.burt@glbcc.com">glenn.burt@glbcc.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>Dave, I just pulled one of those out in a battery retrofit, I don't know what the customer did with it...</div><div dir="auto">Maybe a Morningstar relay controller could be setup using system voltage?</div><div dir="auto"><br></div><div dir="auto"><br></div><div><br></div><div>-Glenn</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Jun 3, 2025 14:22, Dave Tedeyan via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br type="attribution"><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi all, </div><div><br></div><div>What are people using these days for venting a good ol' 48v flooded lead acid battery box? I am upgrading an off grid system. There is a one year old set of flooded lead acid batteries, so those will stay, but everything else will be new. I plan on using a Sol-Ark inverter. The existing battery box does not have any active ventilation, so I would like to add some. In the past, I have used the Zephyr Power Vent Fans, like this one:</div><div><a href="https://www.thesolarbiz.com/zephyr-power-vent-fan-for-48-volt-battery-systems.html" target="_blank">https://www.thesolarbiz.com/zephyr-power-vent-fan-for-48-volt-battery-systems.html</a></div><div>They don't seem readily available, but I think I can find one somewhere.</div><div><br></div><div>More importantly, what would you use to control this? Sol-Ark inverters do not have any kind of relay for it. I have found external controllers in the past (Yandina LLC Vent Control), but I cannot seem to find any right now. There is one noted in the fan documentation (Solar Converters, Inc. VCS1AH), but that does not seem available anywhere right now. Does anyone have a recommendation for either a vent fa controller or a whole venting solution?</div><div><br></div><div>Thanks!<br>-Dave</div>-- <br><div dir="ltr"><div dir="ltr"><br style="color:rgb(34,34,34)"><div dir="ltr" style="color:rgb(34,34,34)"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"></div></div></div><div dir="ltr"><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;color:rgb(68,68,68);width:525px;font-size:11pt;font-family:arial,sans-serif"><tbody><tr><td width="125" valign="top" rowspan="6" style="padding:0px 10px 0px 0px;font-size:10pt;border-right:1px solid rgb(236,189,0);width:125px;vertical-align:top"><a href="https://www.sungineersolar.com/" style="color:rgb(51,122,183);background-color:transparent" target="_blank"><img border="0" alt="Logo" width="105" src="https://sungineersolar.com/wp-content/uploads/2019/08/Logo-Image-Only-1.png" style="border: 0px; vertical-align: middle; width: 105px; height: auto;"></a></td><td style="padding:0px 0px 0px 10px"><table cellpadding="0" cellspacing="0" style="border-spacing:0px;border-collapse:collapse;background-color:transparent"><tbody><tr><td valign="top" style="padding:0px 0px 5px 10px;width:400px;vertical-align:top"><span style="color:rgb(236,189,0);font-size:11pt;font-weight:700">Dave Tedeyan, P.E.<br></span><span style="font-size:11pt;font-weight:700"><font color="#ecbd00">Owner | Sungineer Solar</font><br></span></td></tr><tr><td valign="top" style="padding:5px 0px 5px 10px;font-size:10pt;vertical-align:top;line-height:17px"><span style="color:rgb(236,189,0)"><span style="font-weight:700">p: </span></span><span style="font-size:10pt;color:rgb(0,0,0)">he | him | his</span><span style="color:rgb(236,189,0)"><span style="font-weight:700"><br>a: </span></span><span style="font-size:10pt;color:rgb(0,0,0)">1653 Slaterville Rd.</span> <span style="font-size:10pt;color:rgb(0,0,0)">| Ithaca, NY 14850</span><br><span style="color:rgb(236,189,0)"><span style="font-weight:700">w:</span></span><a href="http://www.sungineersolar.com/" style="color:rgb(51,122,183);background-color:transparent" target="_blank"><span style="font-size:10pt;color:rgb(0,0,0)"> www.sungineersolar.com</span></a><br><span style="color:rgb(236,189,0)"><span style="font-weight:700">c:</span></span><span style="font-size:10pt;color:rgb(0,0,0)"> (607) 270-0370</span></td></tr></tbody></table></td></tr></tbody></table></div></div></div></div></div></div>
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